Extend deletion guards to all non-archived versions and add bulk-archive action

[claude]

Product Description

When a service provider, assistant, pipeline, or collection is deleted, the UI now correctly blocks deletion if any non-archived experiment version references the object — including non-working, non-published snapshot versions that were previously silently ignored.

The "Cannot delete" modal now also shows a "Archive All Non-published Versions" button for non-working, non-published versions, so users can bulk-archive those references in one click instead of navigating to each version manually. Working and published versions still require manual cleanup.

Technical Description

• Added is_blocking_object(obj) and is_bulk_archiveable(obj) helpers in apps/utils/deletion.py

  • is_blocking_object: any non-archived object blocks deletion
  • is_bulk_archiveable: non-working (working_version_id is set), non-published (is_default_version=False), non-archived — eligible for the bulk action

• Updated get_related_experiments_queryset / get_related_experiments_with_pipeline_queryset in apps/assistants/models.py and apps/documents/models.py to return all non-archived versions (not only working/published)

• Updated every delete view (apps/service_providers/views.py, apps/assistants/views.py, apps/documents/views.py, apps/pipelines/views.py) to:

  • Categorise blocking refs as manual-only (working + published) vs bulk-archiveable
  • Pass bulk_archiveable_experiments / bulk_archiveable_ids / bulk_archive_url to the modal template

• Added bulk_archive_experiment_versions view (POST experiments/versions/bulk-archive/) that atomically archives a list of non-working, non-published versions scoped to the team

• Updated templates/generic/referenced_objects.html to render a "Non-published versions" section with the bulk-archive form when applicable

Migrations

• The migrations are backwards compatible

No migrations — only logic changes.

Demo

1. Create an experiment with a service provider, create snapshot versions (v2, v3) referencing it
2. Attempt to delete the service provider → modal now lists working/published versions under "Manual cleanup" and v2/v3 under "Non-published versions (can be bulk-archived)"
3. Click "Archive All Non-published Versions" → v2 and v3 are archived, page refreshes
4. If no other references remain, the service provider can now be deleted

Docs and Changelog

• This PR requires docs/changelog update

Closes #3197

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